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slip (electricity)
Science; General science
A numerical value used in describing the performance of electrical couplings and induction machines. In an electrical coupling, slip is defined simply as the difference between ...
filbert
Science; General science
A nut from any plant in the genus Corylus ; also called hazelnut. About 15 species are recognized, distributed widely over the North Temperate Zone and ranging in size from ...
platyasterida
Science; General science
A Paleozoic (Ordovician and Devonian) order of sea stars of the class Asteroidea; only two genera have been recognized. Platyasteridans have relatively elongate flat arms; broad, ...
vitamin a
Science; General science
A pale-yellow alcohol, soluble in fat but not in water. In pure form, it is readily destroyed by oxidation and light, which may cause losses during storage.
polyoma virus
Science; General science
A papovavirus (member of a DNA-containing group of animal viruses) that infects rodents. This virus can induce a wide variety of tumors when inoculated into newborn animals. The ...
cube
Science; General science
A parallelepiped whose six faces are all squares. The cube (see illus. ) is one of the five regular solids known to the ancient Greeks, who proposed the famous problem (now ...
pelycosauria
Science; General science
A paraphyletic grade of fossil (extinct) synapsids that is ancestral to later forms, such as the therapsids and mammals. (Paraphyletic means not containing all of the descendants ...
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